I have an old Dell SC440 server with Win2003 R2 server. There are two hard drives with software mirroring. One of them is with bad sectors so I shut down and disconnect that bad hard drive on SATA0, and then reboot the server. It gives me an error message during the POST:
SATA0 hard drive not found...
Press F1 to continue or Press F2 to enter setup...
At this point, normally I can simply press F1 to continue booting up successfully to the OS. But this time, the whole keyboard is just dead. If I re-connect the very same SATA0 hard drive there will NOT be any error and will successfully boot up to the OS without any prompt.
The strange thing is, even with the SATA0 disconnected, the keyboard is still working until the error message pops up. Prior to the error I can hit F2 to get into set up or <alt>/<Cntrl>/<Del> to reboot, etc.
I searched on the web and found none of suggestions is working, such as pressing the power switch for 10 seconds to release electricity in capacitors, reset the CMOS battery, reset blue pins, replace keyboards, replug different USB ports, disable USB booting in BIOS, ...etc.